java例程练习（Point类及简单测试）

public class Test {public static void main(String[] args) {Point p = new Point(1.0, 2.0, 3.0);System.out.println(p.getDistance(new Point(0.0, 0.0, 0.0)));p.setX(5.0);System.out.println(p.getDistance(new Point(0.0, 0.0, 0.0)));}}class Point {private double x;private double y;private double z;Point(double x, double y, double z) {this.setX(x);this.setY(y);this.setZ(z);}public void setX(double x) {this.x = x;}public double getX() {return x;}public void setY(double y) {this.y = y;}public double getY() {return y;}public void setZ(double z) {this.z = z;}public double getZ() {return z;}public double getDistance(Point p) {return (x - p.x)*(x - p.x) + (y - p.y)*(y-p.y) + (z - p.z)*(z - p.z);  }}